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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y-3+4 = (2*y)/y-3 // - (2*y)/y-3
6/y-((2*y)/y)-3+3+4 = 0
6/y-3-2+3+4 = 0
6*y^-1 = -2 // : 6
y^-1 = -1/3
-1 < 0
1/(y^1) = -1/3 // * y^1
1 = -1/3*y^1 // : -1/3
-3 = y^1
y = -3
y = -3
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